Julius Feurich
http://www.feurich.com/Geschichte%20engl.htm

Challen
http://www.pianos.co.uk/info/pianos/c/challen.php

Behning
http://www.bluebookofpianos.com/kron2.htm

Ricca & Sons
http://www.bluebookofpianos.com/big%20E/agesr.htm

A History of the Piano
http://www.uk-piano.org/history/history_1.html

Australian Piano Technicians Guild
http://www.aptta.org.au/

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